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Oil-immersed transformers

Oil-immersed distribution and power transformers from Xuzhou, China, including the S22-M, energy-efficiency Grade 1 from 630 to 2 500 kVA at 10 kV, and the SZ20 with on-load tap-changer.

Across our oil-immersed and dry-type ranges we build from 6 to 35 kV and up to 31 500 kVA, for 6, 10, 11, 13.2, 13.8, 15, 20, 22, 33, 34.5 and 35 kV networks at 50 or 60 Hz. Low-voltage sides we build include 0.4, 0.415 and 0.433 kV.

Oil-immersed transformer with radiator banks, a conservator and an on-load tap-changer compartment, in the factory hall

Oil-immersed transformer with radiators and a conservator, in the factory hall.

  • S22-M

    Energy-efficiency Grade 1 (NX1) under GB 20052-2024 across the filed range, 630 to 2 500 kVA at 10 kV. Fully sealed tank.

    Type-test certificate 20260592, May 2026, IEC 60076 and GB standards

    See S22-M

  • SZ20

    On-load tap-changer, 35 kV class.

    Type-test report (2025) 皖检JZ字第0594号, August 2025, GB standards

    See SZ20

  • S20

    Energy-efficiency test report 24119B30120 on S20-M-2000/10-NX2, April 2024, Grade 2 under GB 20052-2020 (source: company brochure)

    Ask about S20

  • S13

    Three-dimensional wound core.

    Test report 24M0758-S on S13-M-400/15/0.4, 2024

    Ask about S13

  • SH15

    Amorphous-alloy core.

    No report published here yet

    Ask about SH15

S11

Ask about this series

[TBC: kVA range and voltage classes per series]

Tested units

Third-party labs type-tested these units. Select a line to find it on the certificate.

S22-M, 2 000 kVA

S22-M-2000/10-NX1, oil-immersed power transformer, 2 000 kVA, 10 kV. Tested 18 to 22 May 2026; report issued 24 May 2026.

Lab
China National Center for Quality Inspection and Test of Electrical Apparatus Products. CMA 230008349829, CNAS L1020, ILAC-MRA
Standards
With 10 Chinese GB and JB/T standards, including GB 20052-2024
Result
Energy-efficiency Grade 1 under GB 20052-2024

Measured losses

Each bar shows the measured loss against the Grade 1 limit in GB 20052-2024 (the line).

  • No-load loss

    Measured 989.0 W. The Grade 1 limit is 1 085 W. 8.8 % below. Rated 1 080 W.

  • Load loss

    Measured 12 659.0 W. The Grade 1 limit is 13 180 W. 4.0 % below. Rated 13 175 W.

Documents

Type-test certificate 20260592 for S22-M-2000/10-NX1, issued by the China National Center for Quality Inspection and Test of Electrical Apparatus Products. Issue date and signature blurred.
Show the whole page
  • Type-test certificate 20260592
  • Report 26M1152-S
  • Energy-efficiency report CEL-A-20260523-951581

A type-test certificate applies to the sample tested in its report.

Ask for the full report

All tests, standards and filing for S22-M
Unit
Tests
Standards
Filing
DQJC-2026-10438: S22-M, 630 to 2 500 kVA, 10 kV, issued 5 June 2026

SZ20, 8 000 kVA

SZ20-8000/35, oil-immersed power transformer with on-load tap-changer, 8 000 kVA, 35/10.5 kV. Tested 13 July to 12 August 2025; issued 12 August 2025.

Lab
Anhui Product Quality Supervision & Inspection Research Institute
Standards
GB/T 1094.1, .2, .3, .5 and .10With GB/T 6451-2023, GB/T 7595-2017 and JB/T 501-2021
Result
PassedType test, including measurements before and after the short-circuit withstand test

[TBC: measured losses for the SZ20]

Documents

  • Report (2025) 皖检JZ字第0594号

Ask for the full report

All tests, standards and filing for SZ20
Unit
SZ20-8000/35, oil-immersed power transformer with on-load tap-changer, 8 000 kVA, 35/10.5 kV
Tests
Type test, including measurements before and after the short-circuit withstand test
Standards
GB/T 1094.1, GB/T 1094.2, GB/T 1094.3, GB/T 1094.5, GB/T 1094.10, GB/T 6451-2023, GB/T 7595-2017, JB/T 501-2021

Standards in the test reports

S22-M
IEC 60076-1, -2, -3, -5 and -10; GB/T 1094.1, .2, .3, .5 and .10; GB/T 6451-2023; GB/T 7595-2017; GB 20052-2024; JB/T 10088-2016; JB/T 501-2021. Report 26M1152-S.
SZ20
GB/T 1094.1, .2, .3, .5 and .10; GB/T 6451-2023; GB/T 7595-2017; JB/T 501-2021. Report (2025) 皖检JZ字第0594号.
Other series
[TBC: standards each series is designed and tested to, including IEC 60076]

What to send for a quote

A quote is quicker when we have these. Send what you know.

  • Rated power (kVA) and quantity
  • Primary and secondary voltage, and the tapping range
  • Frequency: 50 or 60 Hz
  • Vector group, for example Dyn11
  • Cooling, and indoor or outdoor installation
  • The standard your project specifies
  • Destination port or site, and the delivery date you need

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